Published: May 21, 2025
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paper reading thread - "Large Language Diffusion Models"

Image in tweet by attentionmech

> LLaDA, a diffusion model > forward data masking, and a reverse process .. overall trained via pretraining + SFT > competitive with strong LLAMA3 8b in ICL, and good Instrcut following after SFT > interesting result that it does better against reversal curse against GPT4o

Image in tweet by attentionmech

> from the graph looks like it has a better overall non-spiky characterstics.. this is a 8B model > but zeroshot/fewshot defintely signals that nothing can be said about multi-turn > to me it appears that the methods which can't give multi-turn performance via diffusion are just

Image in tweet by attentionmech

> what a lucid and clear view of the space.. (ARM = autoregressive) > capabilities of LLMs are result of generative principles not as per say autoregressive modeling (ARM) > toh the limitations of LLMs are more reflective of their autoregression (trivial yeah) > 'While ARMs

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> uses masked diffusion model > discrete random masking process and trains a mask predictor to approximate a reverse process (for example, in normal diffusion DDIM, you train to predict noise, and reverse process is needed for continuous refinement of predictions) > approach

Image in tweet by attentionmech

> unlike autoregression => it defines the model distribution thru a forward and backward process (typical diffusion) > imagine a process of learning...you can't like learn anything in 'jumps'.. so you incrementally learn stuff... same way here the forward process slowly starts

Image in tweet by attentionmech

lemme try to put it more simply prompt = "This is a diffusion process" response = "ldkfjlsfdkgjsdfjglsdkfjgjldfjglsdkfjgsfl" backward process = "idk<MASK>s<MASK>" now again, it will retry from the representation it got from backward process, until it can fill all the masked

Image in tweet by attentionmech

its a interesting blend imo, not technically going away with transformers as per se (since mask prediction is still doing that)... seems to me they are simulating a diffusion process over transformers architecture

Image in tweet by attentionmech

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